Lemma 2.2 [1]}
Let \(F,\)  \(G\)  be two non-constant meromorphic functions sharing \((1,t),\)  where \(1\le t<\infty .\)  Then
\(&& \overline{N}(r,1;F) + \overline{N}(r,1;G)-\overline{N}(r,1;F \mid = 1) +(t-\frac{1}{2})\overline{N}_{*}(r,1;F,G) \\&\le & \frac{1}{2} [N(r,1;F) + N(r,1;G)].\) 

